Red-Faced and Red-Handed

As a guy who will never learn to stop committing this blunder in the workplace, would you ladies please tell me how you always seem to know precisely when the guy you pass in the hall is going to turn around to check out your ass? Because 9 times out of 10, that guy is me, and despite my best efforts to camouflage my intentions -- including such manuevers as the "turning around to look at something before you even enter my field of vision so that I don't actually have to turn around and you, in fact, just walk right in front of me" and the "counting an extra ten seconds so as to not be cuaght turning around imemdiately after I pass you" -- I always get caught. Are the perverts just a bit easier to pick out of a crowd? Or are all us guys just dogs? Head-swiveling, ass-ogling dogs?